A "register" widget other than through meta?

I am currently using "Shocking Blue Green" theme. My friend Patty over at http://www.oboeinsight.com/ has a "register" option under meta, while I don't. People want to leave messages on my website, but they are not sure how to register. I don't know if I don't get a "register" option because of my theme or what, but is there a way to add it via a "text" widget?